Two British servicemen have been killed in southern Afghanistan in separate incidents.
A soldier from 1st Battalion Scots Guards was killed by small arms fire in the Lashkar Gah District of Helmand Province on Sunday.
A Royal Marine, from 40 Commando, died in an explosion while on foot patrol in the Sangin District of Helmand Province also on Sunday.
Next of kin have been informed, MoD officials have confirmed.
Spokesman for Task Force Helmand, Lieutenant Colonel David Southall, said: "It is with great sadness I inform you that a soldier from 1st Battalion Scots Guards was killed in Lashkar Gah District of Helmand Province yesterday afternoon.
"Commanding his men, he was killed in action by small arms fire whilst providing security to the Afghan people.
"In a separate incident, a Marine from 40 Commando Royal Marines was killed in Sangin, Helmand Province, yesterday afternoon.
"Deployed within a foot patrol providing local security to the people in the district, he died in an explosion.
Neither incident was linked with the ongoing operation to oust Taliban insurgents from a stronghold in southern Afghanistan.
Hundreds of British troops are taking part in Operation Tor Shezada, which has entered its fourth day.